AS and A Level: Waves & Cosmology
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Stretching Rubber Bands
Therefore the load it can take will be 0g. I also predict that each time the rubber band is stretched it will be slightly longer then it was previously. This is because rubber is a polymer, which has a very tangled structure. It looks like this:  Every time it is stretched the structure becomes less tangled, thus making it longer. For this reason, I believe for each set of results the extension will increase slightly. Apparatus * Clamp and stand * Rubber band * 1g weights and holder * G clamp * Meter ruler * Mirror * Pin Safety I will ensure that the following things happen, to ensure the experiment is safe:  * Safety glasses are worn while the rubber band is being stretched.
 Word count: 1298

Investigation to find a value of g using the oscillations of a spiral spring.
I took 7 results for both experiments. The preliminary tests, were to test the spring, and see how far it could stretch before exceeding its elastic limit. I loaded the spring up, with slotted masses. One at a time, until the spring broke. I measured the extension for each load, and plotted a graph from my results. I could see on my graph, that where the line was straight, the spring hadn't exceeded its elastic limit. Where the graph began to curve was where it had exceeded its limit.
 Word count: 1460

To find out if the motion of an elastic band changes the tension, by the rate of its extension
The elastic band will be catapulted off the end of another meter stick, in front of the ones that are taped to the wall. The band will be flung off the end of a meter stick, because the extension of the band can be measured easily using the units along the side of the meter rule. The height reached at each extension of the band will be recorded in a table of results along with a row of predicted heights at which the band may reach with each extension.
 Word count: 1585

To find out if Hooke’s Law can be proved with a steal spring and to see what would happen if the spring is stretched beyond the elastic limit.
To make the tests fair I will use the same spring and set of weights each time. Also I will add the weight proportionally in 1 Newton (10kg) each time. Therefore the change in weight will remain the same. My prediction is that Hooke's Law can be proved through a steel spring, as if the weight on the spring will increase so will the extension. The apparatus needed to do this experiment are a steel spring, a metre ruler, a clamp and weights. Hooke's Law found that extension is proportional to the downward force acting on the spring.
 Word count: 1372

Investigating factors which affect the period of an oscillating spring
Fair test I will keep this experiment fair by using the same spring each time to ensure the constant "k" stays the same. I will be pulling the spring down by the same amount each time and I will be using the same ruler to take all measurements. Range and Repeats I will be taking 10 readings ranging from 100g to 1000g I intend to repeat the experiment twice carrying it out 3 times in all. This way I can obtain more accurate and reliable results.
 Word count: 1047